DNA Paternity Testing From DNA Diagnostics Center. DDC is one of the largest DNA testing companies in the world. Founded in 1995, DDC offers comprehensive DNA testing services for paternity and other family relationships. DDC performs over 600,000 DNA tests annually.
1 When the burner of a stovetop is very hot, it is a source of heat energy. 2  Anything placed onto the stovetop and warmed, whether a pot of tea or a skillet for frying eggs, also become sources of heat energy. 3  Automobile fuels such as gasoline are sources of heat energy, as is the hot engine of a racecar or a school bus.
In all the many, many ways there are of generating fire there are remarkably few ways in which heat is generated. In fact there are only five that are normally used: 1. Friction. This is where kinetic energy (the energy of movement) is converted into heat energy by two or more objects rub against one another.